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f5146e3ef0
While doing smcr_port_add, there maybe linkgroup add into or delete
from smc_lgr_list.list at the same time, which may result kernel crash.
So, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in
smcr_port_add.
The crash calltrace show below:
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G
Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014
Workqueue: events smc_ib_port_event_work [smc]
RIP: 0010:smcr_port_add+0xa6/0xf0 [smc]
RSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297
RAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918
R10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4
R13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08
FS: 0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0
PKRU: 55555554
Call Trace:
smc_ib_port_event_work+0x18f/0x380 [smc]
process_one_work+0x19b/0x340
worker_thread+0x30/0x370
? process_one_work+0x340/0x340
kthread+0x114/0x130
? __kthread_cancel_work+0x50/0x50
ret_from_fork+0x1f/0x30
Fixes:
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.. | ||
af_smc.c | ||
Kconfig | ||
Makefile | ||
smc_cdc.c | ||
smc_cdc.h | ||
smc_clc.c | ||
smc_clc.h | ||
smc_close.c | ||
smc_close.h | ||
smc_core.c | ||
smc_core.h | ||
smc_diag.c | ||
smc_ib.c | ||
smc_ib.h | ||
smc_ism.c | ||
smc_ism.h | ||
smc_llc.c | ||
smc_llc.h | ||
smc_netlink.c | ||
smc_netlink.h | ||
smc_netns.h | ||
smc_pnet.c | ||
smc_pnet.h | ||
smc_rx.c | ||
smc_rx.h | ||
smc_stats.c | ||
smc_stats.h | ||
smc_sysctl.c | ||
smc_sysctl.h | ||
smc_tracepoint.c | ||
smc_tracepoint.h | ||
smc_tx.c | ||
smc_tx.h | ||
smc_wr.c | ||
smc_wr.h | ||
smc.h |